Capacitive Touch Panel Sensitivity Adjustment via Dynamic Threshold
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Solution Overview
Problem
Capacitive touch panels are overly sensitive when charging and lose sensitivity when discharging, leading to inconsistent performance due to static electricity interference.
Innovation Solution
A method for adjusting the sensitivity of capacitive touch panels by building look up tables for charging and discharging stations, which include threshold values and computational methods to adjust the touch signal threshold based on current electrical quantities, using a capacitive touch panel with a transparent conductive layer and conductive trace to detect and adjust sensitivity dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the capacitive touch panel is charging, then the sensitivity is too high due to total capacitance multiply effect, but the touch panel becomes overly sensitive and susceptible to interference
Solution Approach 1:
The patent applies dynamics by making the touch threshold dynamic rather than fixed. The controller adjusts the touch threshold based on the charging state of the touch panel. When charging, the threshold is increased to prevent false triggers from capacitance multiplication; when not charging, the threshold returns to normal for optimal sensitivity. This dynamic adjustment resolves the contradiction between maintaining high sensitivity and preventing over-sensitivity during charging.
Solution Approach 2:
The patent changes the parameter of touch threshold voltage dynamically based on charging state. By monitoring whether the touch panel is charging and adjusting the threshold parameter accordingly (higher during charging, lower during normal operation), the system resolves the contradiction between measurement precision and susceptibility to harmful factors.
2Measurement precision
If the electrical quantity of the capacitive touch panel reduces, then the sensitivity gradually reduces, but the touch panel loses responsiveness
Solution Approach 1:
The patent implements feedback by continuously monitoring the electrical quantity (charge level) of the capacitive touch panel and using this information to adjust the touch threshold. The controller receives feedback about the charging state and automatically compensates for sensitivity changes by adjusting the threshold parameter, ensuring consistent touch responsiveness regardless of charge level.
Solution Approach 2:
The touch panel system performs self-adjustment by automatically modifying its own touch threshold based on its internal charging state. The system monitors its own electrical quantity and adjusts the sensitivity parameter without external intervention, maintaining optimal performance across different charge levels.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method stabilizes the sensitivity of capacitive touch panels by dynamically adjusting the threshold values according to charging and discharging states, reducing interference from static electricity and maintaining consistent performance.
Implementation Method 1
Capacitive touch panels have been widely used due to their higher sensitivity
Implementation Method 2
detect current electrical quantity, and determining whether the touch panel is charging
Data Source
AI summary
The present application relates to a method for adjusting the sensitivity of a touch panel. A look up table is built. The look up table includes a charging station look up table and a discharging station look up table. The charging station look up table includes a threshold value (V0m) of a touch signal, an electrical quantity (A0i) corresponding to the threshold value (V0m), and a computational method g1. The discharging station look up table includes the threshold value (V0m), the electrical quantity (A0i), and a computational method g2. The current electrical quantity and whether the capacitive touch panel is charging are detected. According to the current electrical quantity, the state of charging or discharging, and the computational method g1 or g2, the threshold value (V0m) is adjusted.